IA Mobile is supported on the iOS version currently required by the DOT COE.
View latest IA release notes here.
Tap the confirmation buttons on your device, highlighted below in red, when they come up after tapping the install button above and opening the application.
After installation, the app may not open because it's not from a developer recognized by your device. If you encounter this issue, please follow these steps.
Cancel the "Untrusted Enterprise Developer" warning
Open the "Settings" app
Access the "Device Management" section of the "General" settings
Select the "Cornerstone Systems Northwest, Inc." item in the "Enterprise App" list
Select the "Trust Cornerstone Systems Northwest, Inc." item, then tap the "Trust" button on the dialog box that pops up.